It looks easy to use for technophobes like me who don't like Facebook and lots of adverts,
It's better explained on the website itself, but it does the social discussion thing, it's main features are real time ride reports, routes, and an amazing emergency accident function that will contact the ambulance etc if you don't respond when you suddenly come to a halt whilst riding. Most importantly it passes your exact location (well, your phone's location anyway)!
Apparently Yamaha and BMW have signed up to promote it, as well as Michael Dunlop who will use it at the TT and for his practice until then.
For those worried about tracking, it DOESN'T have a speed tracking function, deliberately so, and they have no intention of including one in the future

http://www.realrider.com/

